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UNITEDPOWERSeries MC: Power Distribution Modulesfor Mission Critical Applications

Series MC PDMsComplete Your Power System Design WithMission Critical Series Power Distribution ModulesUnited Power’s Mission Critical PowerDistribution Modules (PDMs) allow you toextend the redundancy of your criticalpower system from the service entranceto the output distribution circuits feedingyour critical load. By extending your system’sredundancy, Series MC PDMsensure that you receive maximum benefitfrom the investment you already havein your critical power system. Dual utilityfeeds, redundant back-up engine generatorsand sophisticated UPS systems shouldfeed a power distribution unit thatincreases the system’s overall reliabilityand flexibility.Until now, virtually all computer powerdistribution units featured a single maincircuit breaker and one high isolationtransformer feeding multiple panelboardsfor distribution of the protected power tothe critical loads. However, Series MCPDMs bring redundancy to the point ofuse level by introducing dual input circuitbreakers, dual transformers and astatic transfer switch, depending on theSeries MC platform you choose.Series MC distribution units are customengineeredto maximize the strengths ofyour entire critical power system. Weoffer four basic pre-engineered “platforms,”each of which may be custom-tailoredto meet the requirements of yourspecific application.SOURCE ASOURCE BEQUIPMENTROOMSWITCHGEARINPUTCBCOMPUTERROOMSTANDARD PDMTRANSFORMERPANELBOARDSTO CRITICAL LOADIn the past, system redundancy often stopped before the power distribution unit. Eachload was fed from a PDM with a single input breaker and a single high isolation transformer.EQUIPMENTROOMSOURCE ASOURCE BINPUTCB 1INPUTCB 2COMPUTERROOMMISSION CRITICAL PDMTRANSFORMER1TRANSFORMER2STATICTRANSFERSWITCHPANELBOARDSTO CRITICAL LOADNow, the Series MC PDM brings system redundancy to the point of use level by introducingdual input circuit breakers, dual transformers and static transfer switches.Series MC PDMs complement your power system design,allowing you to:• Improve power reliability— Superior designs and quality components• Improve power availability— Redundancy for maximum protection• Improve system maintainability— Routine service with no downtime requiredInnovation in design has made United Power atechnological leader in the critical power industry.Our Series MC PDMs are engineered to provideadvanced solutions for critical power environmentsby maximizing system reliability and allowing systemmaintenance and repair without downtime.

Mission Critical Power Distribution Is TheInnovative Solution To Our Customers’ NeedsSeries MC PDMs were born in the search for anadvanced solution to a difficult problem. In a criticalpower environment, downtime can mean the loss ofthousands of dollars per second for your company. Inlistening to our customers, we heard consultants andfacility managers from such mission critical environmentsrepeat two major concerns:• How can we maximize reliability of our criticalpower system from the utility source to the load?• How can we maintain and repair the entirecritical power system, including the PDM, withoutdowntime?Drawing on our experience and knowledge in powerdistribution products, United Power combined thelatest technology and innovative design strategies todevelop the Series MC PDMs. The result is anextremely flexible power distribution unit that can beeasily modified to work with any critical power system,regardless of configuration! Today, Series MCsystems are engineered to protect some of the mostprestigious sites in the country — from major financialdata centers to high-tech manufacturing processes.United Power Products Are Born Of ExperienceAnd InnovationUnited Power personnel have been designing andmanufacturing power conditioning and distributionequipment for critical power environments for nearly20 years. Our broad product line includes:• Dual Feed & Static Switch PDMs• Power Distribution Systems• UL Listed Power Distribution Cables• Transient Voltage Surge Suppression• K-Rated, Isolation & Phase ShiftTransformers• Rotary & Static Power ConditioningSystems• Single-Phase UPS (4-18 kVA)• Single-Phase Central Lighting InvertersMC-3 PDMUnited Power Series MC PDMs are custom-engineered to complement your criticalpower applications.United Power’s innovation in power equipmentdesign is recognized by a growingcustomer list of more than 3,000 corporate,industrial and government sites. Wehave the technology and experience necessaryto serve the most demanding customerrequirements.Quality is a promise and a priority at UnitedPower. Series MC PDMs are manufactured todemanding quality control standards. In addition,all our products meet stringent UL standards.Wepledge to provide every customer superior serviceand knowledgeable engineering support.

Series MC-1 and MC-2Series MC PDMs Offer Cost Effective Internal RedundancyAnd Make-Before-Break TransfersUnited Power’s MC-1 and MC-2 systems provide costeffectivesolutions to those Mission Critical applicationswhere the user wants to optimize power availabilityand system maintainability. A permissive signal fromthe upstream power sources verifies synchronizationand allows the user to initiate a “make-before-break”transfer from one side of the system to the other. Thistransfer may be made by manual operation of the maininput circuit breakers or through push-button controlswhen our automatic control configuration has beenselected. With either configuration, our advanced controllogic prevents the possibility of operator error. Themake-before-break transfer allows the user to performsystem maintenance without downtime to the criticalload. Redundant PDM input circuit breakers andtransformers dramatically reduce recovery time inthe event of an equipment failure (MC-2).MC-1 — Flexible System BypassUnited Power MC-1 systems are the first step in maximizingthe benefits of bringing redundancy into thePDM. The MC-1 is the least expensive member of ourMission Critical PDM product line and provides theuser with a second main input circuit breaker protectivedevice. This design is often used as an economicalmaintenance bypass to accommodate theoutput of one UPS and its synchronized bypasssource. This integrates the system bypass functioninto the PDM rather than into expensive externalbypass switchgear.MC-1 main input breakers are electrically interlocked forsafe manual operation. They may also be automaticallyoperated for those sites where push-button controlsare desired. All MC-1 systems feature the use of UnitedPower’s advanced control logic to ensure properoperation of the two main input circuit breakers.SERIES MC-1 PDMBYPASS FEEDCB2UPS BYPASSPERMISSIVESIGNAL FROM UPSCONTROLLOGICMC-1 PDMUPS INPUTUPSSYSTEMCB1MC PDMs improve system availabilityand maintainabilityThe above one-line diagram illustrates an MC-1 PDM used for power distribution and UPSsystem bypass functions.Data processing facilities know that loss ofpower means lost data that can result in the lossof millions of dollars per minute. United Powerfully understands the complex requirements ofcritical power loads. We designed our Series MCPDMs to be the intelligent solution for providingthe most reliable and maintainable power distributionsystem offered today.

MC-2 — Dual Transformers For MaximumProtection And MaintainabilityUnited Power MC-2 systems extend the redundancyin your power distribution unit beyond the maininput breakers by including a second impedancematchedtransformer for maximum maintainabilityand protection against potential single points of failure.The MC-2 load may be transferred from one side ofthe unit to the other in a “make-before-break” manner.This allows system maintenance without downtime,an essential feature of a mission critical site. To completethe design, all MC-2 systems include outputbreakers in our two-device, classic three-device “tie”,or our unique four-device “criss-cross” configuration.The MC-2 output breakers are available with eithermanual or automatic (push-button) operation basedon your personal preference. Simply provide UnitedPower a permissive signal that confirms that the twoinputs of the PDM are fed from synchronized sourcesand make-before-break operation is allowed. The controlswithin the MC-2 do the rest to ensure safe andreliable operation of this advanced distribution system.INPUTSOURCE BPERMISSIVESIGNAL(BY OTHERS)INPUTSOURCE ACB2CB1CONTROLLOGICOur MC-2 three breaker “tie” configuration allows you to place100% of the load onto either side of the PDM for system maintenancewithout downtime. During normal operation, each transformersupports no more than 50% of the load.CB4CB3CB5MC-1 and MC-2 FeaturesFeatureMC-1 MC-2System kVA Range75-300kVA S SSystem VoltagesInput: 480V 3 phase, Output: 208/120V 3 phase S SInput: 208V 3 phase, Output: 208/120V 3 phase O OOther international voltage & frequency combinations O OLoad Transfer Control (select one below)Padlocks on breakers S N/AElectrically interlocked breakers S SMotor operated breakers S SInput Circuit BreakersDual input circuit breakers S SLightning Arrestor/Surge SuppressorHigh energy surge protection on the transformer primary O OIsolation TransformersK-13 rated S SK-20 rated O ODual impedance matched transformers N/A SHarmonic mitigating transformers O N/AOutput Circuit Breakers (select one below)Two breaker output bus N/A SThree “tie” breaker output bus N/A SFour “Criss Cross” breaker output bus N/A STransient Voltage Surge SuppressionOne stage (L-N) @ 80,000 Amps total O OTwo stage (L-N & N-G) @ 160,000 Amps total O OThree stage (L-N, N-G & L-G) @ 240,000 Amps total O OFocus Microprocessor Controlled MonitoringTrue RMS voltage, current, kVA, demand, alarming, etc. S SThree phase sag/surge transient, THD monitor O ODistribution PanelboardsTwo through eight 42-pole panelboards available S S225 amp secondary main breaker feeding each panelboard S SSubfeed Distribution BreakersUp to four 225A 3-pole breakers in lieu of a panelboard O OS = Standard O = Optional N/A = Not AvailableThe chart above illustrates standard and optional features of theMC-1 and MC-2 systems to help you determine which MissionCritical configuration most closely meets your requirements.The telecommunications industry is a missioncritical environment ensuring continuous communicationthrough such facilities as remote cellularswitching stations and long distance call routingcenters. United Power Series MC PDMs extendthe redundancy of critical power systems in thetelecommunications industry, helping to providethe continuous service expected and required.

Series MC-3 and MC-4Series MC PDMs Offer Static Transfer Switch TechnologyFor Transparent Switching Between SourcesThe MC-3 and MC-4 feature advanced static transferswitch (STS) technology complete with on-board diagnosticsthat monitor each of the two input sources forany abnormal characteristics. In the event of a powerproblem, the STS provides the ability to transfer fromthe preferred power source to the alternate powersource within four milliseconds (less than one-quartercycle). By integrating the ultra-fast STS into the powerdistribution unit, we increase the reliability and flexibilityof your entire critical power system. Other featuressuch as redundant circuit breakers and isolation transformershave made these systems the choice of missioncritical environments across the country.INPUTSOURCE BTRANSFERCONTROLLOGICMCS2MCS1SS2SS1MCS4MCS5PDMCONTROLLOGICCB1MC-3 — Input-Positioned STSINPUTSOURCE AMCS3Model MC-3 is the first “platform”within the Mission Criticalproduct line to feature astatic transfer switch (STS).The 100% rated STS is positionedon the input of thesystem’s isolation transformer.In popular 480 Vac input,120/208 Vac output applications,we position the STSat a higher operating voltageto reduce the size and costassociated with the switch.Our “line up and match” cabinetryprovides a clean look forthe data center, clean room orother high-tech environment.Focus Level III microprocessormonitoring is standard on allMC-3 units and a mimic panelis provided to show the criticalpower path of the system.United Power MC-3 systems feature an input-positioned STS,providing 4mS switching between two different sources.A static transfer switch integrated into the PDM increases system reliability and flexibility.MC-4 PDMProcess control environments require missioncritical power distribution to ensure consistentperformance and accurate control in productionand manufacturing. From process flow controlsto robotics, United Power MC PDMs provide bothreliable and maintainable power distribution technologyfor today’s sophisticated manufacturingprocesses.

MC-4 — Output-Positioned STS On DualTransformersUnited Power’s MC-4 is the ultimate power distributionsystem and is currently supporting some of thenation’s most critical data processing facilities. In theMC-4, we have combined the attributes of the STSwith dual high isolation transformers to optimize theredundant characteristics of the system. As a result,the MC-4 provides increased reliability, maintainability,and availability of conditioned power for yourcritical load. Perhaps this is why so many of our customershave chosen this PDM configuration.The MC-4 boasts flexibility not found in other distributionsystems. For clients with a high concentrationof “dual corded” loads, we can feed “dual corded”loads directly from the output of the isolation transformersand feed “single corded” loads from the STSoutput. This will typically reduce the necessaryampere rating of the STS while optimizing reliabilityand cost.INPUTSOURCE BINPUTSOURCE ACB2PDM BCONTROLLOGICPDM ACONTROLLOGICCB1TRANSFERCONTROLLOGICMCS2MCS1SS2SS1MCS4MCS5MCS3MC-3 and MC-4 FeaturesFeatureMC-3 MC-4System kVA Range75-300kVA S SSystem VoltagesInput: 480V 3 phase, Output: 208/120V 3 phase S SInput: 208V 3 phase, Output: 208/120V 3 phase O OOther international voltage & frequency combinations O OStatic Transfer Switch (STS)STS on transformer primary S N/ASTS on transformer secondary N/A SFive switch STS bypass circuit S SSix switch STS bypass circuit O OTransformer Input BreakersSingle circuit breaker (for single transformer systems) S N/ATwo circuit breakers (for dual transformer systems) O SLightning Arrestor/Surge SuppressorHigh energy surge protection on the transformer primary O OIsolation TransformersK-13 rated S SK-20 rated O ODual impedance matched transformers O SHarmonic mitigating transformers O N/ATransient Voltage Surge SuppressionOne stage (L-N) @ 80,000 Amps total O OTwo stage (L-N & N-G) @ 160,000 Amps total O OThree stage (L-N, N-G & L-G) @ 240,000 Amps total O OFocus Microprocessor Controlled MonitoringTrue RMS voltage, current, kVA, demand, alarming, etc. S SThree phase sag/surge transient, THD monitor O ODistribution PanelboardsTwo through eight 42-pole panelboards available S S225 amp secondary main breaker feeding each panelboard S SPanelboards for “Dual Corded” loads N/A OSubfeed Distribution BreakersUp to four 225A 3-pole breakers in lieu of a panelboard O OS = Standard O = Optional N/A = Not AvailableTwo main breakers, two impedance-matched transformers, anda five-device STS are combined to create the ultimate MissionCritical PDM.The chart above illustrates standard and optional features of theMC-3 and MC-4 systems to help you determine which MissionCritical configuration most closely meets your requirements.Semi-conductor fabrication relies on robotic systemsto ensure efficiency and reliability in production.Microprocessor-controlled machine toolsprovide absolute repeatability and require missioncritical power distribution to ensure quality products.United Power’s Series MC PDMs can be custom-engineeredto meet the power distributionrequirements of any manufacturing need.

Series MC PDMsGeneral SpecificationskVA75-300 kVA, 3-phaseInputDual feed compatible3-phase, 3 wire plus ground208, 480 or 600 Vac, 60 HzOutput3-phase, 4 wire plus ground208/120 Vac, 60 HzTransformerK-13, K-20 optionalDouble shieldedCopper windingsCompensation taps:2 @ 2.5% above nominal4 @ 2.5% below nominalGroundSingle point per FIPS PUB 94Static Transfer Switch (MC-3 & MC-4)100% rated for continuous duty100% non-linear load capability1/4 cycle transfer timeWrap around maintenance bypassDistribution225A, 42-pole panelsMain CB protection per panelPlug-in or bolt-on branch CBsSub-feed breakers available (>100A)Metering (True RMS)Input voltage and output voltagePhase A, B, C, neutral and grd currentkVA, kW, kWHFrequencyPercent loadPower factorSag/surge/transient/THD (optional)AlarmingHigh voltageLow voltageHigh currentPhase lossGround faultPhase rotationTransformer high temperatureTransformer shutdownSummary alarmAnnunciation80-character LCD displayAlarm hornAcknowledge pushbuttonIlluminated EPO pushbuttonPower flow mimic panel (MC2-4)Physical Specifications: Series MC PDMs (480 Vac Input, 60 Hz)Model No. kVA Panelboards Width (In)* Depth (In) Height (In) Weight (Lb)MC-1MC1MC1MC1MC1MC1MC1MC-2MC2MC2MC2MC2MC2MC2MC-3MC3MC3MC3MC3MC3MC3MC-4MC4MC4MC4MC4MC4MC475100125150200225300751001251502002253007510012515020022530075100125150200225300444444444444464444444444444643.543.543.543.543.543.553989898989898117109.5109.5109.5109.5109.5109.5109.5129129129129129129149Consult factory for MC PDM systems requiring other voltage configurations.* United Power offers a wide variety of output distribution options. Width dimension is subjectto change based on different output distribution configurations.* All dimensions are for systems requiring front access only for routine field service. Widthdimension may be reduced when rear clearance is available. Consult factory for applicationsassistance and custom AutoCAD drawing generation for your custom MC PDM.UL478 (PDM) and 1008 (STS) Listed • NEMA • NEC • ANSI • IEEE • FIPS 94UNITEDPOWER34343434343434343434343434343434343434343434343434343434696969696969696969696969696969696969696969696969696969691,2501,3601,5201,6301,9002,0102,7802,3502,5702,8903,1103,6503,8705,3102,4502,5602,7202,8303,1003,2103,9503,1403,3603,6804,2004,5804,8006,700United Power Corporation2132 Tomlynn Street, Richmond, VA 23230(804) 359-6500 (800) 545-4426FAX (804) 359-6659www.unitedpowercorp.comProduct information is subject to change as warranted by manufacturing or engineering processes.United Power reserves the right to make changes, additions or deletions in equipment design and/orcomponents.MC 8PG 3/98-15K